So I'm building a new computer after 3 years of having this Athlon XP system. I'm thinking of getting an Athlon 64 3000+. Is there a large performance increase in the 512k cache vs. 1mb cache, will there be in the future. Same thing for the 120nm vs. 90nm, is there a large performance increase, will there be in the future? I haven't really taken any look at Intel, do they have any decent 64-bit processors that aren't that expensive?